HOLOTHURIANS. 149 



regard H. willeyi as the possible young of H. moebii, from which it differs in the 

 presence of tables and absence of H-shaped deposits, but it would be rash without 

 further evidence to assume that the tables migrate during growth to the tube-feet 

 and there become converted into the H-shaped supporting structures mentioned by 

 Ludwig, just as the tables in Stichopus japonicus have been shown by Mitsukuri to 

 become converted into the perforated plates of Holothuria armata, the two forms being 

 merely different stages in the life history of a single species. 



11. Holothuria dijficilis Semper? C. Semper. Reisen Philipp. Hoi. p. 92. 



References: H. Ludwig. 22 Ber. d. Oberh. Gesell. Giessen, 1883, p. 173. 



H. Theel. Challenger, Holothuroidea, 1885, pp. 219, 220. 



H. Ludwig. Zool. Jahrb. Syst. HI. 1888, p. 807. 

 Loc. Loyalty Islands. 



One specimen 4 cm. long, colour whitish with dark violet blotches; I was at 

 first inclined to refer this specimen to Actinopyga parvula; but I could not make 

 certain of the existence of anal teeth ; and the discs of the tables are better developed 

 than in that form, the number of peripheral holes averaging about 25 in number 

 and placed in 2 or .3 concentric circles; buttons generally with 8 holes, sometimes 

 more, rarely fewer. 3 Poliau vesicles, 1 small free stone-canal, Cuvierian organs large. 



Seems to be more closely related to A. parvula than to H. vagabunda. 



12. Actinopyga mauritiana Quoy and Gaimard. 



Miilleria mauritiana. v. Sclenka. Z. f. w. Z. 18, 1868, p. 116. 

 Miilleria varians Selenka. E. Selenka. Z. f. w. Z. 17, 1867, p. 310. 

 Taf. xvn. figs. 4—9. 



Reference: K. Lampert. Zool. Jahrb. Syst. IV. 1889, p. 813. 



Loc. Lifu, Loyalty Islands. 



Several specimens from 35 cm. to 11cm. in length; no distinct arrangement of 

 ventral feet in rows although they are more closely situated in some places than in 

 others; the colour seems to be very variable, the dorsal side is generally darker 

 than the ventral, and there are nearly always indications of lighter spots surrounding 

 the dorsal papillae. 



The tentacles were in all cases retracted; in one specimen (the only one in 

 which they were counted) they numbered 26. Deposits &c. quite typical. 



13. Actinopyga lecanora Jaeger. 



References: v. Semper. Reisen Philipp. Hoi. 1868, pp. 75, 76, Taf. xxx. fig. 7. 

 Ludwig. Z. f. w. Z. 35, 1881, pp. 592, 593. 

 Ludwig. Sitz. Ak. d. Wiss. Berlin, 1887. Hft. ii. p. 1223. 

 Loc. Loyalty Islands. 



Two specimens, 20 cm. and 4-5 cm. in length. In the smaller specimen the ventral 



feet are in 3 quite distinct rows, the interambulacra being quite devoid of them, anal 

 area lighter than rest of surface but not so conspicuously so as in the larger specimen. 



